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Green and environmentally-friendly preparation method of graphene with low defect and large size

A green and low-defect technology, applied in the field of preparation of new carbon materials, can solve the problems of high environmental protection cost and pressure, low output and high cost

Inactive Publication Date: 2012-07-04
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Vapor deposition and micromechanical exfoliation have the disadvantages of low yield and high cost
The oxidation-reduction method can produce graphene in large quantities, but this method uses a large amount of strong oxidants and strong acids, as well as the carcinogen hydrazine for reduction, so the cost and pressure of environmental protection are very high

Method used

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  • Green and environmentally-friendly preparation method of graphene with low defect and large size
  • Green and environmentally-friendly preparation method of graphene with low defect and large size
  • Green and environmentally-friendly preparation method of graphene with low defect and large size

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1. Acrylic acid is dissolved, RAFT reagent and initiator are added, and polymerization takes place under a nitrogen environment to obtain polyacrylic acid (PAA). The two monomers are copolymerized according to the mass ratio PAA:PEGA=2:1 to obtain a copolymer. The copolymer reacts with 1-pyrenemethanol for esterification. The polymer was then dissolved, graphite powder added, and sonicated. After standing overnight, the supernatant liquid was centrifuged. Final annealing removes the polymer.

Embodiment 2

[0012] Embodiment 2. Change the mass ratio in 1 to PAA: PEGA=1: 1 (2g in total), and others are as in embodiment 1.

Embodiment 3

[0013] Embodiment 3. Change the mass ratio in 1 to PAA: PEGA=1: 2 (3g in total), and others are as in embodiment 1.

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PUM

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Abstract

The invention provides a green and environmentally-friendly preparation method of graphene with low defect and large size. The preparation method comprises the steps of: synthesizing a pyrene-terminated copolymer by a RAFT (Reversible Addition Fragmentation Chain Transfer) polymerization method, and directly stripping monolayer graphene from the graphite surface through pi-pi superposition on the basis of not destroying the conjugation structure of graphene. According to the method, strong acid, strong base and cancerogenic substance hydrazine are not used, graphene is directly stripped from graphite, graphene with large size, low defect and excellent conductibility is prepared and the graphene preparation method is green and environmentally friendly; and as compared with the vapor deposition method and micro-mechanical stripping method, the method has the advantages of low cost, mass production and the like.

Description

technical field [0001] The method involves a physical exfoliation method for graphene preparation, using an amphiphilic copolymerized polymer to directly peel graphene from graphite to prepare large-size, low-defect single-layer graphene, which belongs to the preparation of new carbon materials field. Background technique [0002] Graphene is a new type of carbonaceous material that is densely packed into a two-dimensional honeycomb crystal structure by a single layer of carbon atoms. This two-dimensional material has an almost perfect crystal structure and excellent crystallographic properties, contains rich and novel physical phenomena, and has important theoretical research value and broad application prospects. [0003] Among the many hot researches on graphene, the preparation method of graphene is undoubtedly the focus of the research. There are many methods for preparing graphene, such as vapor deposition, micromechanical exfoliation, redox and so on. Vapor deposit...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01B32/19
Inventor 刘敬权王蕊刘震李爱华
Owner QINGDAO UNIV
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